skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effect of intermediate Minkowskian evolution on CMB bispectrum

Abstract

We consider a non-inflationary early Universe scenario in which relevant scalar perturbations get frozen out at some point, but then are defrosted and follow a long nearly Minkowskian evolution before the hot era. This intermediate stage leaves specific imprint on the CMB 3-point function, largely independent of details of microscopic physics. In particular, the CMB bispectrum undergoes oscillations in the multipole l space with roughly constant amplitude. The latter is in contrast to the oscillatory bispectrum enhanced in the flattened triangle limit, as predicted by inflation with non-Bunch-Davies vacuum. Given this and other peculiar features of the bispectrum, stringent constraints imposed by the Planck data may not apply. The CMB 3-point function is suppressed by the inverse duration squared of the Minkowskian evolution, but can be of observable size for relatively short intermediate Minkowskian stage.

Authors:
;  [1]
  1. Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22373662
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2014; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COSMOLOGICAL INFLATION; FUNCTIONS; LIMITING VALUES; MATHEMATICAL EVOLUTION; OSCILLATIONS; PERTURBATION THEORY; SCALARS; SPACE; UNIVERSE

Citation Formats

Mironov, S. A., Rubakov, V. A., and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. Effect of intermediate Minkowskian evolution on CMB bispectrum. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/04/015.
Mironov, S. A., Rubakov, V. A., & Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. Effect of intermediate Minkowskian evolution on CMB bispectrum. United States. https://doi.org/10.1088/1475-7516/2014/04/015
Mironov, S. A., Rubakov, V. A., and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru. 2014. "Effect of intermediate Minkowskian evolution on CMB bispectrum". United States. https://doi.org/10.1088/1475-7516/2014/04/015.
@article{osti_22373662,
title = {Effect of intermediate Minkowskian evolution on CMB bispectrum},
author = {Mironov, S. A. and Rubakov, V. A. and Ramazanov, S.R., E-mail: sa.mironov_1@physics.msu.ru, E-mail: Sabir.Ramazanov@ulb.ac.be, E-mail: rubakov@ms2.inr.ac.ru},
abstractNote = {We consider a non-inflationary early Universe scenario in which relevant scalar perturbations get frozen out at some point, but then are defrosted and follow a long nearly Minkowskian evolution before the hot era. This intermediate stage leaves specific imprint on the CMB 3-point function, largely independent of details of microscopic physics. In particular, the CMB bispectrum undergoes oscillations in the multipole l space with roughly constant amplitude. The latter is in contrast to the oscillatory bispectrum enhanced in the flattened triangle limit, as predicted by inflation with non-Bunch-Davies vacuum. Given this and other peculiar features of the bispectrum, stringent constraints imposed by the Planck data may not apply. The CMB 3-point function is suppressed by the inverse duration squared of the Minkowskian evolution, but can be of observable size for relatively short intermediate Minkowskian stage.},
doi = {10.1088/1475-7516/2014/04/015},
url = {https://www.osti.gov/biblio/22373662}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2014,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}
}